JET_END_TEST_F
JET_BEGIN_TEST_F(FmmLevelSetSolver2, Extrapolate) {
Size2 size(160, 120);
Vector2D gridSpacing(1.0/size.x, 1.0/size.x);
double maxDistance = 20.0 * gridSpacing.x;
FmmLevelSetSolver2 solver;
CellCenteredScalarGrid2 sdf(size, gridSpacing);
CellCenteredScalarGrid2 input(size, gridSpacing);
CellCenteredScalarGrid2 output(size, gridSpacing);
sdf.fill([&](const Vector2D& x) {
return (x - Vector2D(0.75, 0.5)).length() - 0.3;
});
input.fill([&](const Vector2D& x) {
if ((x - Vector2D(0.75, 0.5)).length() <= 0.3) {
double p = 10.0 * kPiD;
return 0.5 * 0.25 * std::sin(p * x.x) * std::sin(p * x.y);
} else {
return 0.0;
}
});
solver.extrapolate(input, sdf, maxDistance, &output);
saveData(sdf.constDataAccessor(), "sdf_#grid2,iso.npy");
saveData(input.constDataAccessor(), "input_#grid2.npy");
saveData(output.constDataAccessor(), "output_#grid2.npy");
}
JET_END_TEST_F
JET_BEGIN_TEST_F(FmmLevelSetSolver2, Reinitialize) {
CellCenteredScalarGrid2 sdf(160, 120), temp(160, 120);
FmmLevelSetSolver2 solver;
// Starting from constant field
sdf.fill([](const Vector2D& x) {
return 1.0;
});
saveData(sdf.constDataAccessor(), "constant0_#grid2,iso.npy");
solver.reinitialize(sdf, 160.0, &temp);
saveData(temp.constDataAccessor(), "constant1_#grid2,iso.npy");
// Starting from SDF field
sdf.fill([](const Vector2D& x) {
return (x - Vector2D(80, 80)).length() - 32.0;
});
saveData(sdf.constDataAccessor(), "sdf0_#grid2,iso.npy");
solver.reinitialize(sdf, 160.0, &temp);
saveData(temp.constDataAccessor(), "sdf1_#grid2,iso.npy");
// Starting from scaled SDF field
sdf.fill([](const Vector2D& x) {
double r = (x - Vector2D(80, 80)).length() - 32.0;
return 2.0 * r;
});
saveData(sdf.constDataAccessor(), "scaled0_#grid2,iso.npy");
solver.reinitialize(sdf, 160.0, &temp);
saveData(temp.constDataAccessor(), "scaled1_#grid2,iso.npy");
// Starting from scaled SDF field
sdf.fill([](const Vector2D& x) {
double r = (x - Vector2D(80, 80)).length() - 32.0;
return (r < 0.0) ? -0.5 : 0.5;
});
saveData(sdf.constDataAccessor(), "unit_step0_#grid2,iso.npy");
solver.reinitialize(sdf, 160.0, &temp);
saveData(temp.constDataAccessor(), "unit_step1_#grid2,iso.npy");
}
void LevelSetLiquidSolver2::extrapolateVelocityToAir(double currentCfl) {
auto sdf = signedDistanceField();
auto vel = gridSystemData()->velocity();
auto u = vel->uAccessor();
auto v = vel->vAccessor();
auto uPos = vel->uPosition();
auto vPos = vel->vPosition();
Array2<char> uMarker(u.size());
Array2<char> vMarker(v.size());
uMarker.parallelForEachIndex([&](size_t i, size_t j) {
if (isInsideSdf(sdf->sample(uPos(i, j)))) {
uMarker(i, j) = 1;
} else {
uMarker(i, j) = 0;
u(i, j) = 0.0;
}
});
vMarker.parallelForEachIndex([&](size_t i, size_t j) {
if (isInsideSdf(sdf->sample(vPos(i, j)))) {
vMarker(i, j) = 1;
} else {
vMarker(i, j) = 0;
v(i, j) = 0.0;
}
});
const Vector2D gridSpacing = sdf->gridSpacing();
const double h = std::max(gridSpacing.x, gridSpacing.y);
const double maxDist
= std::max(2.0 * currentCfl, _minReinitializeDistance) * h;
JET_INFO << "Max velocity extrapolation distance: " << maxDist;
FmmLevelSetSolver2 fmmSolver;
fmmSolver.extrapolate(*vel, *sdf, maxDist, vel.get());
applyBoundaryCondition();
}
